ShinyHunters claim massive data theft from CyrusOne, a data center used by Microsoft and Meta

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ShinyHunters adds CyrusOne to its victim list, demanding $13m ransom

Claimed theft includes 12.9 million Salesforce records, 600GB SharePoint data, PII, contracts, and facility diagrams

Breach could enable physical intrusions and supply‑chain attacks; CyrusOne has not commented or paid

The infamous ShinyHunters ransomware crew has added CyrusOne, a major US data center operator, to its list of victims, claiming to have stolen a treasure trove of highly sensitive data which, if proven true, could turn this into a bonafide catastrophe for the company and its customers.

Overall, ShinyHunters claims to have exfiltrated 12.9 million Salesforce records, more than 182,000 rows from the Salesforce Contacts object, more than 600 GB of SharePoint data, more than 8,300 employee records containing personally identifiable information (PII), executed contracts, master service agreements, NDAs, and service agreements, data center floor plans, electrical diagrams, access-control records and badge audits, physical key inventories, security policies, critical Environment Reliability Management documentation, and various passwords and credential artifacts.

No samples have been posted just yet, but researchers don’t see it as suspicious, but rather as a pressure tactic.

What makes this attack different

In exchange for deleting all of the stolen data, ShinyHunters is demanding $13 million from CyrusOne which, at this time, is not commenting on the claims, and is seemingly not interested in negotiations.

“They are refusing to pay a $13 million demand. They have 24 hours left to engage with us. We hold 12.9 million Salesforce records,” the attackers allegedly wrote.

Ransomware groups steal sensitive corporate data all the time, but this incident has the potential to be among the most devastating data breaches ever. Some of the secrets that were nabbed cannot simply be changed: data center floor plans, electrical diagrams, access-control records, badge audits, physical key inventories, this kind of intelligence can be used for physical breaches.

If criminals know how keys are assigned, how the data center is organized, where surveillance cameras are located, and how guards operate, it makes it easier to physically break it.

“You can’t patch a building,” the researchers warned, noting that some of the things that can be changed, such as physical keys and access zones, still take months and “real money”, they added, hinting at just how big the problem could be.

CyrusOne runs some 50 facilities all across the United States and serves hundreds of companies and corporations. Some of its clients include Fortune 1000 companies, as well as big tech names such as Microsoft, Meta, Verizon, AT&T, IBM, and CME Group.

Compounding the problem even further is the fact that ShinyHunters stole information about CyrusOne’s customers, such as Meta, or Microsoft. Information about the locations of certain customers, the services they’re paying for, the NDAs, service-level agreements, and contact information, can all be used for highly tailored, sophisticated phishing attacks that could turn this incident into an unprecedented third-party supply-chain attack.

“Contracts, MSAs, and NDAs identify the tenants as a customer list overlaid on a building map, with pricing and SLAs attached,” the researchers added.

No reaction

To add insult to injury, ShinyHunters also seems to have stolen information about the company’s power, cooling, and critical-environment reliability processes, which they could leverage to physically attack the servers, causing disruptions, outages, and possibly fires.

The group first added CyrusOne to their site on August 20 2026, although at that moment, the name of the victim was redacted, the researchers said. Instead, ShinyHunters posted a warning, saying “Final warning - pay or leak”. The company was given until August 24 to reach out which, it would seem, did not happen.

Three days later, on August 23, ShinyHunters publicly named CyrusOne as their victim, and stated that they demanded $13 million for the files. We are now well past the deadline, and nothing’s changed - the victim hasn’t spoken out, and ShinyHunters did not leak the files.

Via Cybernews